Figure 7.2. In this figure, in order to accommodate the midrange control, the corner frequencies of the bass and treble have been moved lower for the bass and higher for the treble. The values are roughly the same as for a standard tone control but they are shifted lower and higher for bass and treble respectively. On the bass end the five curves start at 10 Hz and come together to a single line at about 270 Hz. For the treble end starting at 100 kHz and moving down in frequency the five curves come together at about 1.7 kHz. The ideal would be for the curves to remain combined as a single line between these two frequencies, but they don't. The separate slightly to a span of a little more than 1 dB. Also the order is reversed from the cut and boost parts of the graph.
The magnitudes at 10 Hz are as follows.
Green, minus 21.
Blue, minus 9.
Red, minus 1.5.
Light blue, 5.5.
Purple, 16.5.
At 100 kHz.
Green, minus 13.
Blue, minus 7.
Red, minus 2.5.
Light blue, 1.5.
Purple, 6.5.
End verbal description.
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